摘要
为分析在路面随机激励作用下担架的振动特性,利用白噪声过滤方法模拟路面随机激励,考虑了车辆前后轮激励的迟滞性和左右轮辙激励的相关性,建立路面随机激励时域模型,根据拉格朗日原理建立救护车-担架-卧位人体系统十自由度振动动力学方程。利用Simulink工具,建立救护车-担架-卧位人体系统受路面随机激励作用的仿真模型,采用控制变量法分析担架放置位置因素对担架振动特性的影响。通过分析表明:担架左右支撑到车身质心距离对担架的振动特性没有影响;前后支撑到车身质心的距离只影响担架的垂直振动特性。
To analyze the vibration property of a stretcher under the effect of road random excitation,the road random excitation time domain model was set up,by using white noise filtering method to simulate the road random excitation,and considering the hysteresis of vehicle＇s front and rear wheels excitation and the correlation of vehicle＇s left and right wheels track excitation. According to the principle of Lagrangian,ten degree of freedom vibration dynamic equation for AmbulanceStretcher-Supine Body System was established. Using Simulink tools,the simulation model of Ambulance-Stretcher-Supine Body System influenced by the road random excitation was set up. At the same time,it analyzed the impact on the stretcher vibration property which is from location of the stretcher by using the method of control variables. Through the analysis shows that the distance of stretcher＇s left and right bracket to center of mass of the body has no effect on vibration characteristics of the stretcher,the distance of stretcher＇s before and after bracket just has effect on vertical vibration characteristics of the stretcher.
出处
《机械设计与制造》
北大核心
2015年第10期31-34,38,共5页
Machinery Design & Manufacture
基金
国家自然科学基金项目(51375519)
关键词
救护车-担架-卧位人体系统
十自由度
路面随机激励
振动模型
仿真分析
Ambulance-Stretcher-Supine Body System
10 Degree of Freedom（DOF）
Road Random Excitation
Vibration Model
Simulation Analysis
